[問題] operator=()內為何判斷物件是否等於this
參考網頁http://openhome.cc/Gossip/CppGossip/CopyConstructorAndAssign.html
// 重載=指定運算子
SafeArray& SafeArray::operator=(const SafeArray &safeArray) {
// 這邊始終不懂，看了很多說明還是不知道判斷這行的用意是甚麼
if(this != &safeArray) {
length = safeArray.length;
// 先清除原有的資源
delete [] _array;
_array = new int[safeArray.length];
for(int i = 0; i < safeArray.length; i++) {
_array[i] = safeArray._array[i];
}
}
return *this;
}
有請高手點一下
謝謝!
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雖然他有DELETE 但是他有先NEW一個空間出來才賦值
delete [] _array;
//事先刪掉在配置一個
//一般來說不是會有DEFAULT值嗎
//只是值會很怪而已吧
_array = new int[safeArray.length];
for(int i = 0; i < safeArray.length; i++) {
_array[i] = safeArray._array[i];
}
這樣會有問題嗎 QQ
感謝前輩相助
※ 編輯: kumusou 來自: 39.14.67.162 (08/20 19:52)
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